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JPS5427420

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DESCRIPTION JPS5427420
Specification L. Title of the Invention Multi-way Speaker Device (1) A multi-way speaker device
having a plurality of speakers, which is a low-pass speaker and a high-frequency speaker for
single sine wave pulses corresponding to 1 〆〆 number of frequencies near one crossover point.
Crossover frequency of each speaker by adjusting the characteristics of the speaker itself, the
characteristics of the network, and the positional relationship between the speakers in the frontrear direction so that the response time of the energy response of the high range speaker
matches the response time of the speaker. A multi-way speaker device characterized in that
effective sound sources in the vicinity are matched to suppress time difference distortion
between speakers.
2, the scope of claims
DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a multi-way
speaker device, and is intended to improve acoustic characteristics by considering transient
characteristics near the crossover frequency and time difference distortion characteristics. The
sound source position of the speaker is that all pulse signals are applied to the speaker, and the
response waveform measured by the microphone is computer simulated scene by the point
sound source model, and the spread of the sound source of the speaker and the position of the
sound source are accurately determined. Can. As a result, it has been found that the spread of the
sound source of the speaker depends on the primary sound source determined by the shape and
material of the diaphragm of the speaker and the secondary sound source generated by the
diffraction of the speaker box or the like. Although the sound source position of the sweet
speaker was considerably different depending on the type of the speaker, it was found that the
position was present at a position roughly around the boundary between the diaphragm and the
voice coil. Note that the sound source position of the speaker accurately shows frequency
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dependency. Follow me. In the conventional method of attaching the speaker units to the same
flat baffle plate as in the prior art, the sound source position between the speakers causes a
considerable deviation in the longitudinal direction. For example, when a cone type is used as the
woofer (1) and a dome type is used as the tow or the squawker 12B, the sound source position
(A) of the woofer is compared with the sound source position t (Y) K of the other speakers. Will
be in the back (see Figure 1). Therefore, in the cross-end page: 1 bar frequency range, not only
the time difference distortion between the two speakers is large, the transient response
characteristic is not only deteriorated, but also a peak and a valley are generated in the sound
pressure characteristic even for the continuous waveform. It had become. As described above,
the sound source position of the speaker itself exhibits frequency dependency exactly. In the
multi-way speaker apparatus, the delay effect of the network is also added, and the apparent
sound source position of the -8 speaker moves from -71, the sound source position of the
speaker itself. Hereinafter, the apparent sound source position including the network will be
referred to as an effective sound source. When matching the effective sound source position of
each speaker in the multi-way speaker apparatus, it differs depending on the frequency to be
noted. In the multi-way speaker system, the connection of sounds near the crossover point is
important. For this reason, it is desirable to match the effective sound sources of both speakers at
a frequency near the cross oats (-. Therefore, it is necessary to determine an average effective
sound source around the crossover frequency in each speaker.
The frequency spectrum F of a single sinusoidal pulse of frequency fc + is Where f o is a single
sine wave) (the frequency of the pulse) and f is the frequency. That is, frequency f. The single
sine wave pulse of is a complex sound including frequency components of a certain band by the
magnitudes indicated by the above equation. Therefore, using this single sine wave pulse, it is
possible to determine a sound source weighted for each frequency, that is, an average sound
source necessary to further improve the sound quality of the multi-way speaker system. This
method will be described in detail below. FIG. 2 is a diagram showing an input signal waveform
and each response waveform to the input signal waveform, and (a) shows a single sine wave
pulse of crossover point frequency as the input signal waveform. Now, attach Uno- (1) and
Towter (2) on the same plane (see Fig. 1) on the same plane as in the conventional case (see Fig.
1), and divide the single sine wave and pulse by the network. When both speakers 11 + + 21 K
are applied, the response waveform of woo 71-111 is as shown in FIG. 2 (b), and the response
waveform of tow eater (2) is as shown in FIG. 2 (C). That is, as the response waveform of the
woofer (1) includes more low frequency components of the input signal as it is divided into
bands by the network, it becomes a smooth rising waveform, while the response waveform of the
tweak (2) becomes On the contrary, since it contains more high frequency components, it has a
sharp rising edge waveform. Then, when the woofer (1) and the tweeter (2) are mounted on the
same plane baffle plate, the sound source position is deviated, and the waveform shown in FIG. 2
(1) and the waveform shown in FIG. The waveform shown in FIG. 2Cg) is a waveform shown in
FIG. 2C, which is a waveform different from the input waveform, ie, a waveform having a time
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difference distortion. Therefore, the present invention takes such time difference distortion as M
en. In the case of complex tones, it is necessary to evaluate the arrival time of the average heavy
tone by the strength of the tone. Now, the response waveform (Fig. 2 (1) X (ri)) is considered as
an envelope considering the wave packet, (b) is a waveform as shown in <i>, and (0) is a
waveform as shown in (6) As a result, the waveform of (1) indicates the energy response of the
woofer (1), and the waveform of (Q) indicates the energy response of the toe eater (2). Therefore,
if the energy response (d) of the woofer (1) and the peak point of the energy response (e) of the
toeator (2) coincide, that is, if the peak point times t1 and t2 coincide, the crossover frequency is
around The difference between the arrival times of the sound from the two speakers disappears
in that the average effective sound sources of the woofer and the tweeter are matched.
In order to match the peak points, the characteristics of the speakers themselves, the
characteristics of the network, and the position in the front-rear direction between the speakers
may be adjusted. In practice, the network may be selected in consideration of the acoustic
characteristics of the speaker to be used, and the positional relationship in the front-rear
direction of the speaker may be adjusted so that the aforementioned peak points coincide (see
FIG. 6). Here, the polarities of the two speakers are different depending on the network used, but
when using the normal LC type 12aBloQt network EndPage: 2, they need to be connected in
opposite phases to each other. The response composite waveform of a single pulse of crossover
frequency output from two speakers in such a configuration is as shown in FIG. 2 (f). If (f)-(g) are
compared, it is understood that (f) is closer to the input signal waveform shown in (a). That is, it
can be seen that the positional deviation of the sound source is small, and the time difference
distortion between the two speakers is small. The transient response characteristics around the
swath frequency can be improved, and this can also flatten the so-called frequency sound
pressure characteristics for continuous wave input around the crossover frequency. As described
above, according to the present invention, the effective sound source of the low band speaker
and the high band spy and force in the vicinity of the crossover frequency is matched more in
consideration of the effective sound source including the network as the sound source. Because
the energy response peak values of both speakers are matched by a single sine wave pulse signal
of 9 cross over frequency, a more faithful response waveform with less time difference distortion
especially for a transient input signal. You can get In addition, it is possible to flatten the
continuous wave response characteristics, that is, the so-called characteristics for sound
depending on such a configuration, and to improve the sound quality such as the sound
connection localization feeling of the multi-way speaker device. Although the above description is
for the case of using the high band speaker and the low band speaker, the high band speaker and
the middle band when the high band speaker, the mid band speaker and the low band speaker
are used The adjustments described above may be made between the speakers and between the
mid range speaker and the low range speaker.
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4. Brief Description of the Drawings FIG. 1 is a view showing a conventional speaker
arrangement, FIG. 2 is a view showing an input waveform and a response waveform, and FIG. 3 is
a view showing a speaker arrangement according to the present invention. (1)はウーハ
−1(2)はトウイータ。 Patent applicant Sanyo Electric Co., Ltd.-71, representative Ige i3. し
)EndPage: 3
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